Fourier transform-based absolute phase interrogation algorithm for Sagnac interferometer-based PMF sensors

2015 ◽  
Author(s):  
Yuxuan Chen ◽  
Yuanhong Yang ◽  
Shuo Liu ◽  
Mingwei Yang ◽  
Wei Jin
Keyword(s):  
Fourier Transform ◽  
Sagnac Interferometer ◽  
Absolute Phase ◽  
Phase Interrogation

Fourier transform imaging spectrometry using Sagnac interferometer

2013 ◽  
Author(s):  
Jianxin Li ◽  
Wei Zhou ◽  
Xin Meng ◽  
Defang Liu ◽  
Rihong Zhu
Keyword(s):  
Fourier Transform ◽  
Sagnac Interferometer ◽  
Imaging Spectrometry

Fourier Transform Profilometry with Color Grating by Dot-Array Controlled Absolute Phase Multi-Frequency Grating

2012 ◽  
Vol 32 (7) ◽  
pp. 0712002
Author(s):  
李崇纲 Li Chonggang ◽  
董泳江 Dong Yongjiang ◽  
张汝婷 Zhang Ruting ◽  
林斌 Lin Bin ◽  
曹向群 Cao Xiangqun
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Profilometry ◽  
Absolute Phase

Comparison of Calculated and Recorded Electron Energy-Loss Spectra of Aluminium and Carbon

1990 ◽  
Vol 48 (2) ◽  
pp. 64-65
Author(s):  
L. Reimer ◽  
R. Oelgeklaus
Keyword(s):  
Fourier Transform ◽  
Energy Loss ◽  
Electron Energy ◽  
Rotational Symmetry ◽  
Mean Free Path ◽  
Single Scattering ◽  
Specimen Thickness ◽  
Two Dimensional ◽  
Image Position ◽  
Electron Energy Loss

Quantitative electron energy-loss spectroscopy (EELS) needs a correction for the limited collection aperture α and a deconvolution of recorded spectra for eliminating the influence of multiple inelastic scattering. Reversely, it is of interest to calculate the influence of multiple scattering on EELS. The distribution f(w,θ,z) of scattered electrons as a function of energy loss w, scattering angle θ and reduced specimen thickness z=t/Λ (Λ=total mean-free-path) can either be recorded by angular-resolved EELS or calculated by a convolution of a normalized single-scattering function ϕ(w,θ). For rotational symmetry in angle (amorphous or polycrystalline specimens) this can be realised by the following sequence of operations :(1)where the two-dimensional distribution in angle is reduced to a one-dimensional function by a projection P, T is a two-dimensional Fourier transform in angle θ and energy loss w and the exponent -1 indicates a deprojection and inverse Fourier transform, respectively.

FR-IR Molecular Microanalysis System

1990 ◽  
Vol 48 (2) ◽  
pp. 270-271
Author(s):  
John A. Reffner ◽  
William T. Wihlborg
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Integrated System ◽  
Morphological Examination ◽  
Fully Integrated ◽  
Ir Microscopy ◽  
Normal Functions ◽  
Infrared Microspectroscopy ◽  
Infrared Spectral ◽  
Ft Ir

The IRμs™ is the first fully integrated system for Fourier transform infrared (FT-IR) microscopy. FT-IR microscopy combines light microscopy for morphological examination with infrared spectroscopy for chemical identification of microscopic samples or domains. Because the IRμs system is a new tool for molecular microanalysis, its optical, mechanical and system design are described to illustrate the state of development of molecular microanalysis. Applications of infrared microspectroscopy are reviewed by Messerschmidt and Harthcock.Infrared spectral analysis of microscopic samples is not a new idea, it dates back to 1949, with the first commercial instrument being offered by Perkin-Elmer Co. Inc. in 1953. These early efforts showed promise but failed the test of practically. It was not until the advances in computer science were applied did infrared microspectroscopy emerge as a useful technique. Microscopes designed as accessories for Fourier transform infrared spectrometers have been commercially available since 1983. These accessory microscopes provide the best means for analytical spectroscopists to analyze microscopic samples, while not interfering with the FT-IR spectrometer’s normal functions.

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